Android NFC编程

Android NFC编程可以使用Android SDK中提供的NFC API，具体步骤如下：

1. 在AndroidManifest.xml文件中添加NFC权限

<uses-permission android:name="android.permission.NFC"/>

2. 在Activity中注册NFC事件

@Override
protected void onResume() {
    super.onResume();
    IntentFilter filter = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED);
    try {
        filter.addDataType("text/plain");
    } catch (IntentFilter.MalformedMimeTypeException e) {
        e.printStackTrace();
    }
    Intent intent = new Intent(this, getClass());
    intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent, 0);
    NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(this);
    nfcAdapter.enableForegroundDispatch(this, pendingIntent, new IntentFilter[]{filter}, null);
}

@Override
protected void onPause() {
    super.onPause();
    NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(this);
    nfcAdapter.disableForegroundDispatch(this);
}

@Override
protected void onNewIntent(Intent intent) {
    super.onNewIntent(intent);
    if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())) {
        Parcelable[] rawMessages = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
        if (rawMessages != null) {
            NdefMessage[] messages = new NdefMessage[rawMessages.length];
            for (int i = 0; i < rawMessages.length; i++) {
                messages[i] = (NdefMessage) rawMessages[i];
            }
            String text = new String(messages[0].getRecords()[0].getPayload());
            // 处理接收到的NFC数据
        }
    }
}

3. 在Activity中发送NFC数据

NfcAdapter nfcAdapter = NfcAdapter.getDefaultAdapter(this);
NdefMessage message = new NdefMessage(new NdefRecord[]{NdefRecord.createMime("text/plain", "Hello, world!".getBytes())});
nfcAdapter.setNdefPushMessage(message, this);

使用以上步骤可以实现Android NFC编程。